[Libreoffice-bugs] [Bug 129845] New: vcl: system caching more expensive than not

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=129845

            Bug ID: 129845
           Summary: vcl: system caching more expensive than not
           Product: LibreOffice
           Version: 6.4.0.0.alpha0+
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: michael.meeks at collabora.com

The cost of getSystemDependentData tracking for trivial polylines and polygons
is horribly expensive. Interestingly - the more of it we do, the worse the cost
- since the data stacks up in the background.

I have a patch to avoid blowing this up for headless/ which is particularly
important for Android - will attach a profile shot.

>From the commit msg:

Interestingly the cache map lookup is rather expensive; why:

polyline output for some trivial impress edits:
        count   # of polylines
        2       2134
        3       141
        4       41
        9       4

polypolygon output for some trivial impress edits:

        count   # of polypolygons       geometry.
        3       54    all single polygon
        4       583   ~all single
        9       52    ~ all paired with a 4 node polygon
        13      2     both single
        32      22    all single

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